package test;

import java.util.Scanner;

/**
 * @author 郝文雪
 * @date 2022/8/20 10:35
 * @Description Test
 */
public class 美团1 {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        while(sc.hasNext()){
            int n=sc.nextInt();
            String A=sc.next();
            String B=sc.next();
            StringBuilder res=new StringBuilder();
            for(int i=0;i<n;i++){
                res.append(A.charAt(i));
                res.append(B.charAt(i));
            }
            System.out.println(res.toString());
        }
    }
}
